Coaxial Stirling pulse tube cryocooler with active displacer
Coaxial Stirling pulse tube cryocooler with active displacer
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DOI：
10.1016/j.cryogenics.2020.103143
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发表时间：
2020-10-01
期刊：
影响因子：
2.1
通讯作者：
Liang, Kun
中科院分区：
文献类型：
--
作者：
Abolghasemi, Mohammad Amin;Rana, Hannah;Liang, Kun
同轴脉冲管制冷机是选择的配置，因为它们允许更好地接触冷头。因此，以前建造和测试的直列式脉冲管制冷机，使用主动位移进行相位控制，已被改进为同轴结构。主动移位器允许轻松调整脉冲管冷端的质量流量和压力脉冲，以实现最佳性能。移位器还允许回收脉冲管温端的膨胀功率，以便更有效地操作。用Sage数值模型研究了整个制冷机的工作流程，结果表明，驱动制冷机所需功率的6%以上来自脉冲管的热端通过置换器。当使用惯性管或孔板时，这种膨胀的能量以热量的形式消散，这就是为什么使用置换器可以产生更高效的制冷机。此外，还从实验和数值两方面考察了置换器相位和冲程的变化对制冷机性能和压力特性的影响。
Coaxial pulse tube cryocoolers are the configuration of choice as they allow better access to the cold head. Hence, a previously built and tested in-line pulse tube cryocooler which uses an active displacer for phase control has been modified into a coaxial configuration. The active displacer allows the mass flow and the pressure pulse at the cold end of the pulse tube to be easily adjusted for optimum performance. The displacer also allows the expansion power at the warm end of the pulse tube to be recovered in order to operate more efficiently. A numerical Sage model is used to demonstrate this by examining the work flows throughout the cryocooler and it is shown that more than 6% of the power required to drive the cryocooler comes from the warm end of the pulse tube via the displacer. When using an inertance tube or orifice, this expansion power is dissipated as heat which is why using a displacer can lead to a more efficient cryocooler. Moreover, the effect of changing the displacer phase and stroke on cryocooler performance and pressure characteristics is examined both experimentally and numerically.